* debian/rules:

* debian/rules:
  - drop all hardening rules now done by dh in compat mode 9.
  - update gdmflexiserver path for multi-arch paths.
* debian/compat bumped to 9.
* debian/control:
  - added build-deb on dpkg-dev (>= 1.16.1) for hardening support.
  - dropped hardening-includes from build-depends, now superseeded
  - update debhelper build-dep to 8.9.4 for compat mode v9.
* debian/liblightdm-gobject-1-0.install,
  debian/liblightdm-gobject-dev.install, debian/liblightdm-qt-1-0.install,
  debian/liblightdm-qt-dev.install, debian/lightdm.install:
  - update to use multi-arch folders.
* debian/lightdm.install:
  - in v9 compat mode, libexecdir doesn't have the package name added so
    update in consequence
* debian/*.{postinst,prerm}:
  - update path to lightdm-set-defaults.

git-svn-id: svn://anonscm.debian.org/pkg-xfce/goodies/trunk/lightdm@6057 0c9b3bff-18ee-0310-b944-d1aa2700132f